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Tapasin, or TAPBP (MIM 601962), is a member of the variable-constant Ig superfamily that links major histocompatibility complex (MHC) class I molecules to the transporter associated with antigen processing (TAP\; see MIM 170260) in the endoplasmic reticulum (ER). Additionally we are shipping TAPBPL Proteins (7) and many more products for this protein.
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soluble TAPBPR, consisting of the luminal domain alone, added to intact cells, also functions as an effective peptide editor on surface MHC I molecules.
this study reports the crystal structure of MHC I in complex with the peptide editor TAPBPR (TAP-binding protein-related), a tapasin homolog.
this study presents the x-ray structure of the TAPBPR-MHC I complex, which delineates the central step of catalysis.
The authors identify an interaction between TAPBPR and UDP-glucose:glycoprotein glucosyltransferase 1 (UGT1), a folding sensor in the calnexin/calreticulin quality control cycle that is known to regenerate the Glc1Man9GlcNAc2 moiety on glycoproteins. The results suggest the formation of a multimeric complex, dependent on a conserved cysteine at position 94 in TAPBPR, in which TAPBPR promotes the association of UGT1 with p
It is now clear there are two MHC class I specific peptide editors, tapasin and TAPBPR, intimately involved in controlling peptide presentation to the immune system.
These results support a role of TAPBPR in stabilizing peptide-receptive conformation(s) of MHC-I, permitting peptide editing.
TAPBPR is a new player in the MHC class I presentation pathway. (Review)
The longer TAPBPR protein interacted with MHC class I but was attenuated in its ability to down-regulate surface expression of MHC class I.
the data indicate that TAPBPR and tapasin bind in a similar orientation to the same face of MHC class I.
The function of the tapasin-related protein, TAPBPR, was investigated.
HLA-I, TAP1, CNX, LMP7, Erp57, Tapasin and ERAP1 were down-regulated in 68%, 44%, 48%, 40%, 52%, 32% and 20% of esophageal squamous cell carcinoma lesions then, respectively.
Focuses on cloning and characterization of human TAPBP-R but also identifies the mouse ortholog Tapbpl.
Tapasin, or TAPBP (MIM 601962), is a member of the variable-constant Ig superfamily that links major histocompatibility complex (MHC) class I molecules to the transporter associated with antigen processing (TAP\; see MIM 170260) in the endoplasmic reticulum (ER). The TAPBP gene is located near the MHC complex on chromosome 6p21.3. TAPBPL is a member of the Ig superfamily that is localized on chromosome 12p13.3, a region somewhat paralogous to the MHC.
TAP binding protein-like
, TAP binding protein related
, TAP-binding protein-like
, TAP-binding protein-related protein
, tapasin-related protein